a boy mass increases by 12% between is 10 and 11birthday it is mass was 52 kg on his 10 birthday whats was the amount on his mass on his 11 birthday

12 % = 12 / 100

52 * 12 / 100 = 624 / 100 = 6.24

52 + 6.24 = 58.24 kg

OR

100 % + 12 % = 112 % = 112 / 100 = 1.12

1.12 * 52 = 58.24 kg

To calculate the amount of mass the boy gained between his 10th and 11th birthday, we need to determine the increase of 12% of his mass on his 10th birthday.

Step 1: Calculate the increase in mass:
Mass increase = 12% of 52 kg

To find the 12% of 52 kg:
Mass increase = (12/100) * 52 kg

Mass increase = 0.12 * 52 kg

Mass increase = 6.24 kg

Step 2: Calculate the mass on his 11th birthday:
Mass on 11th birthday = Mass on 10th birthday + Mass increase

Mass on 11th birthday = 52 kg + 6.24 kg

Mass on 11th birthday = 58.24 kg

Therefore, the amount of mass on his 11th birthday is 58.24 kg.

To find the amount of mass on the boy's 11th birthday, we need to calculate a 12% increase from his 10th birthday's mass.

Step 1: Determine the 12% increase of his 10th birthday mass:
12% of 52 kg = (12/100) * 52 kg = 6.24 kg

Step 2: Add the increase to his 10th birthday mass to find his 11th birthday mass:
52 kg + 6.24 kg = 58.24 kg

Therefore, the boy's mass on his 11th birthday would be 58.24 kg.